Artificial tooth-crown.



No. 702,III. Patented Iune IO, I902. J. C. OSBORNE. v

ARTIFICIAL TOOTH CROWN.

I (Application filed July 20, 1901.) (No Model.)

ammo

attorney J6. OSofvw,

w. 7 m m I 0 7 i I .Q 8 v a v 4 I UNITED STATES PATENT} OFFICE.

JOSEPH OpOSBORNE, OF LAWNDALE, NORTH CAROLINA.

ARTIFICIAL TOOTH-CROWN.

SPECIFICATION forming part of Letters Patent No. 702,111, dated June 10,1902.

Application filed July 20, 1901- To all whom it may concern:

Be it known that I, JOSEPH O. OSBORNE, a citizen of the United States,residing at Lawndale, in the county of Cleveland and State of NorthCarolina, have invented anew and useful Artificial Tooth-Oro'wmof whichthe following is a specification.

My present invention relates'to a novel artificial tooth-crown; and myobject is to provide the crown with an improved post for effecting itsmounting upon a natural root with convenience and expedition and in amanner to insure the rigid retention of the crown in place.

A further object of the invention is to so form the pivot-pin orcrown-post as to preclude the possibility of the displacement of thecrown in either alongitudinal or a lateral direction with respect to thepost, and to so dispose the post as to present its'greatest diametersfrom mesial to distal and from palatal to labial, so that the post willbe capable of presenting the greatest resistance in those directionsfrom which it is subjected to the greatest strains. 7

In the accompanying drawings, in which I have illustrated theapplication of my invention, Figure 1 is an elevation of a crown mountedin accordance with my invention. Fig. 2 is a sectional view of thesubject-matter of Fig. 1. Fig. 3 is a similar view taken at right anglesto Figl 2. Figs. 4, 5, and 6 are transverse sectional views on the lines4 4, 5 5, and 6 6 of Fig. 2. Fig. 7 is a longi tudinal sectional view ofthe crown detached, and Fig. 8 is a detail view of the crown-postdetached.

Like numerals of reference refer to corresponding parts and structuralpeculiarities throughout the views.

The natural root 1 and the artificial crown 2 are provided, as usual,with longitudinal recesses or cavities 3 and4 for the reception of theopposite end portions of the crown-post 5. In this general aspect myinvention is allied to the usual forms of mountings for artificialtooth-crowns but it is distinguished'from the usual constructions by'therelative formations of the cavities 3 and 4 in the root and crown and bythe corresponding contours of those portions of the post which engagethe cavities to effect the mounting of the crown.

Serial No. 69,076. (No model.)

The root-engaging end of the post 5. is provided with screw-threads, asindicated at 6,

and is designed to be screwed into the cylindrical socket, channel, orcavity 3 of the root,

while the crown-engaging portion 7 of the One of the distinguishing,characteristicsof; the invention will now be apparent, since byreference to Fig. 5 it will be noted that the post is so disposed withinthe crown 2 as to bring the greatest diameters of said post between themesial and distal-and the palatal and labial. sides, respectively, ofthe crownthat is to say, the square portion of the post hasits severalangles disposed opposite the mesiahdistal, palatal, and labial sides ofthe tooth, so that said post will'present the greatest resistance inthose directions from which the crown is sub jected to the greatestlateral strains. It will also be observed that this angular contour ofthe post will absolutely prevent the turning of the crown thereon, andin order to prevent the longitudinal displacement of the crown I providethe post adjacent to one extremity with a reduced portion or neck 8,defining a" terminal head 9, which bears againstthe end of the cavity 4in the crown. Opposite this the lingual or palatal face of the tooth ispierced by a transverse openingor recess 10, intersecting the cavity 4at the end thereof reduced portion or neck of the crown-post 5 anddesigned to facilitate the introduction of an alloy or other filling 11.This filling, which may be quickly and conveniently inserted, extendsaround the neck 8 of the post,

completely filling the annular cavity there formed, and extends into thetransverse opening or recess 10 to constitute a key, which prevents theslightest longitudinal movement of the crown upon the post. The filling,having been properly inserted, is finished oif flush with the surface ofthe tooth and thecrown will be securelyretained in placenpon the root.

Obviously the order of procedure in efiecting the mounting of the crownin accordance with my invention is not essential, since the crown may besecured upon a post previously set into the root, or the reverse of thisprocedure may be adopted. It is likewise immaterial what metal isadopted in the man ufacture of the post or what material is selected forthe filling. Therefore I desire to be understood as reserving to myselfthe right to efiect any changes, modifications, or variations of theillustrated construction and arrangement which may appear to beexpedient under various conditions, provided only that such variationsare fairly comprehended within the scope of the protection prayed.

What I claim is- 1. An artificial tooth-crown having a longitudinalopening or cavity of square transverse contour, disposed with itsgreatest diameters extending from mesial to distal and from palatal tolabial, and having a transverse opening piercing the palatal face of thetooth and intersecting the cavity.

2. The combination with an artificial toothcrown having a longitudinalcavity and a transverse opening in tersectiug the cavity, of acrown-post extending into the cavity and having a reduced portiondisposed opposite the transverse opening in the crown.

3. The combination with an artificial toothcrown having atransversely-angular longitudinal cavity and a transverse openingintersecting said cavity, of a crown-post corresponding in contour tothe contour of the cavity and fitting therein to prevent the turning ofthe crown upon the post, and means preventing relative end wise movementof the crown and post.

t. The combination with an artificial toothcrown provided with alongitudinal cavity having an angular transverse contour, and atransverse opening intersecting the cavity adjacent to its inner end, ofa crown-post having a cross-sectional contour corresponding to thecontour of the cavity and fitting therein, said post being provided witha reduced portion disposed opposite the transverse opening in the crown,and a filling surrounding the reduced portion of the post and extendedinto the transverse opening in the crown.

5. The combination with an artificial toothcrown provided with alongitudinal cavity having a polygonal cross-sectional contour, and atransverse opening intersecting the cavity at its inner end, of acrown-post of polygonal cross-sectional contour fitted into the cavityin the crown and provided with a termi nal head, and a filling extendedunder the head of the post and into the transverse opening in the crown.

6. The combination with an artificial toothcrowu having a longitudinalcavity of square cross sectional contour, and a transverse openingintersecting the cavity adjacent to the inner end thereof, of acrown-post having a square end fitted into the cavity in the crown andprovided with a reduced portion defining a head located at the end ofthe cavity, and a filling surrounding the reduced portion of the postbelow the head thereof and extended into the transverse opening in thecrown, the greatest diameters of said post being disposed between themesial and distal and between the palatal and labial walls of the crown,respectively.

7. The combination with an artificial toothcrown provided with alongitudinal cavity of angular cross-sectional contour, of an angularcrown-post fitted into the cavity and provided with a terminal head, anda filling extended under the head of the post to prevent detachment ofthe crown.

8. As a new article of manufacture, an artificial crown having alongitudinal cavity of square cross-sectional contour, and a transverseopening iutersecting the cavity, the angles or corners of said cavitybeing disposed opposite the mesial, distal, palatal and labial sides ofthe crown. l

9. As a new article of manufacture, a crown-post having a cylindricalscrew-threaded portion at one end, a round head at its opposite end, arounded reduced neck immediately adjacent to the head, and an angularportion extending from the neck to the cylindrical screw-threadedportion of the post.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

JOSEPH C. OSBORNE.

Witnesses M J. H. RAMsAUR, JOHN L. SCHENCK

